[Bug 607560] Re: jbd2 writing block every 5 - 10 seconds, preventing disk spin-down and making noise

[Anmar Oueja]

After much investigation, i discovered that the output of "hdparm -B
/dev/sda" happen to be my only laptop hard drisk, gives me a value of
128, which permits the HD from spinning down. This is what is prevents
the hard driver from spinning down and not the jbd2 activity.  BTW, I
did a complete fresh install.

from hdparm man page  (notice the bit about 128 being in the range that
prevents spinning down):

   -B       Query/set Advanced Power Management feature, if the  drive  sup‐
              ports  it.  A  low value means aggressive power management and a
              high value means better performance.   Possible  settings  range
              from  values  1 through 127 (which permit spin-down), and values
              128 through 254 (which do not permit  spin-down).   The  highest
              degree  of power management is attained with a setting of 1, and
              the highest I/O performance with a setting of 254.  A  value  of
              255 tells hdparm to disable Advanced Power Management altogether
              on the drive (not all drives support disabling it, but most do).

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jbd2 writing block every 5 - 10 seconds, preventing disk spin-down and making noise
https://bugs.launchpad.net/bugs/607560
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